Samsung has just released the kernel source code for the Sprint and US Cellular versions of the Galaxy S4, models SPH-L720 and SCH-R970, respectively. The timing is likely due to the fact that both devices operate on relatively similar CDMA networks.

The kernel source for these devices mark the first such release for American versions of Samsung's brand-new flagship. That means AT&T, Verizon, T-Mobile, C-Spire, and Cricket source code are still yet to come down the pike.